I prefer to have my phone on silent during the night but I would also like to receive calls from e.g. closely related family members. So I've created two rules: The first one says 'a person calls you from number 111' or 'a person calls you from number 222' or 'a person calls you from number 333' etc.
The second rule says that if the 'time is from 22.00 to 07.00' and 'speaker is off' and 'rule number 1 is matched' then the speaker mode must be switched to vibrate. Then I receive calls from important contacts if something urgent happens while I'm sleeping.
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